/*
Copyright IBM Corp. 2017 All Rights Reserved.

SPDX-License-Identifier: Apache-2.0
*/

package channel

import (
	"context"
	"errors"
	"fmt"
	"io/ioutil"

	pcommon "github.com/hyperledger/fabric-protos-go/common"
	pb "github.com/hyperledger/fabric-protos-go/peer"
	"github.com/hyperledger/fabric/core/scc/cscc"
	"github.com/hyperledger/fabric/internal/peer/common"
	"github.com/hyperledger/fabric/protoutil"
	"github.com/spf13/cobra"
)

const commandDescription = "Joins the peer to a channel."

func joinCmd(cf *ChannelCmdFactory) *cobra.Command {
	// Set the flags on the channel start command.
	joinCmd := &cobra.Command{
		Use:   "join",
		Short: commandDescription,
		Long:  commandDescription,
		RunE: func(cmd *cobra.Command, args []string) error {
			return join(cmd, args, cf)
		},
	}
	flagList := []string{
		"blockpath",
	}
	attachFlags(joinCmd, flagList)

	return joinCmd
}

// GBFileNotFoundErr genesis block file not found
type GBFileNotFoundErr string

func (e GBFileNotFoundErr) Error() string {
	return fmt.Sprintf("genesis block file not found %s", string(e))
}

// ProposalFailedErr proposal failed
type ProposalFailedErr string

func (e ProposalFailedErr) Error() string {
	return fmt.Sprintf("proposal failed (err: %s)", string(e))
}

func getJoinCCSpec() (*pb.ChaincodeSpec, error) {
	if genesisBlockPath == common.UndefinedParamValue {
		return nil, errors.New("Must supply genesis block file")
	}

	gb, err := ioutil.ReadFile(genesisBlockPath)
	if err != nil {
		return nil, GBFileNotFoundErr(err.Error())
	}
	// Build the spec
	input := &pb.ChaincodeInput{Args: [][]byte{[]byte(cscc.JoinChain), gb}}

	spec := &pb.ChaincodeSpec{
		Type:        pb.ChaincodeSpec_Type(pb.ChaincodeSpec_Type_value["GOLANG"]),
		ChaincodeId: &pb.ChaincodeID{Name: "cscc"},
		Input:       input,
	}

	return spec, nil
}

func executeJoin(cf *ChannelCmdFactory, spec *pb.ChaincodeSpec) (err error) {
	// Build the ChaincodeInvocationSpec message
	invocation := &pb.ChaincodeInvocationSpec{ChaincodeSpec: spec}

	creator, err := cf.Signer.Serialize()
	if err != nil {
		return fmt.Errorf("Error serializing identity for %s: %s", cf.Signer.GetIdentifier(), err)
	}

	var prop *pb.Proposal
	prop, _, err = protoutil.CreateProposalFromCIS(pcommon.HeaderType_CONFIG, "", invocation, creator)
	if err != nil {
		return fmt.Errorf("Error creating proposal for join %s", err)
	}

	var signedProp *pb.SignedProposal
	signedProp, err = protoutil.GetSignedProposal(prop, cf.Signer)
	if err != nil {
		return fmt.Errorf("Error creating signed proposal %s", err)
	}

	var proposalResp *pb.ProposalResponse
	proposalResp, err = cf.EndorserClient.ProcessProposal(context.Background(), signedProp)
	if err != nil {
		return ProposalFailedErr(err.Error())
	}

	if proposalResp == nil {
		return ProposalFailedErr("nil proposal response")
	}

	if proposalResp.Response.Status != 0 && proposalResp.Response.Status != 200 {
		return ProposalFailedErr(fmt.Sprintf("bad proposal response %d: %s", proposalResp.Response.Status, proposalResp.Response.Message))
	}
	logger.Info("Successfully submitted proposal to join channel")
	return nil
}

func join(cmd *cobra.Command, args []string, cf *ChannelCmdFactory) error {
	if genesisBlockPath == common.UndefinedParamValue {
		return errors.New("Must supply genesis block path")
	}
	// Parsing of the command line is done so silence cmd usage
	cmd.SilenceUsage = true

	var err error
	if cf == nil {
		cf, err = InitCmdFactory(EndorserRequired, PeerDeliverNotRequired, OrdererNotRequired)
		if err != nil {
			return err
		}
	}

	spec, err := getJoinCCSpec()
	if err != nil {
		return err
	}

	return executeJoin(cf, spec)
}
